Block and Tackle window balance

Question

Marking is 2630 BS MK. The channel length is 27". Channel width is 1/2" (9/16). Channel depth is 5/8". Both top and bottom guildes are winged.

Emily · Accepted Answer

Hello!

With this combination of attachments, you could have either an S380-27 or S385-27 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You will also need the 2630 spring strength option.

Let me know if you have any questions!

Comparison of the S378, S380 and S385 balance shoes.